Alkaline-earth doping in (K,Na)NbO3 based piezoceramics

被引：195

作者：

Malic, B ^{[1
]}

Bernard, J ^{[1
]}

Holc, J ^{[1
]}

Jenko, D ^{[1
]}

Kosec, M ^{[1
]}

机构：

[1] Jozef Stefan Inst, SI-1000 Ljubljana, Slovenia

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2005年 / 25卷 / 12期

关键词：

X-ray methods; piezoelectric properties; niobates;

D O I：

10.1016/j.jeurceramsoc.2005.03.127

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this contribution the effect of alkaline-earth (AE) dopants Mg2+, Ca2+, Sr2+ and Ba2+ on sinterability and functional response of KNN is studied. Ceramic powders with the general formula (K0.5Na0.5)(1-2y)AE(y)NbO(3), y= 0.005 were prepared by classical ceramic processing. The values of 94-95% of theoretical density (TD) are obtained for stoichiometric KNN after sintering at 1115 degrees C for 2 h. Calcium and strontium doping promotes densification while magnesium doping inhibits it. In the case of Ba-doping a secondary phase forms. The dielectric constant and piezo d(33) coefficient determined by Berlincourt piezo d(33)-meter of Ca and Sr-doped KNN ceramics are 500 and 95 pC/N, respectively, while the values for undoped KNN are slightly lower. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：2707 / 2711

页数：5